<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /*base*/
        
        body {
            background-color: #343a40;
        }
        
        .btn {
            display: inline-block;
            padding: 4px 12px;
            margin-bottom: 0;
            font-size: 14px;
            line-height: 20px;
            text-align: center;
            vertical-align: middle;
            cursor: pointer;
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
            border-radius: 4px;
        }
        
        .btn-danger {
            color: #fff;
            background-color: #da4f49;
            border: 1px solid #bd362f;
        }
        
        .btn-danger:hover {
            color: #fff;
            background-color: #bd362f;
        }
        
        .btn:focus {
            outline: none;
        }
        
        .todo-container {
            width: 600px;
            margin: 0 auto;
        }
        
        .todo-container .todo-wrap {
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
        }
        /*header*/
        
        .todo-header input {
            width: 560px;
            height: 28px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
            padding: 4px 7px;
        }
        
        .todo-header input:focus {
            outline: none;
            border-color: rgba(82, 168, 236, 0.8);
            box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
        }
        /*main*/
        
        .todo-main {
            margin-left: 0px;
            border: 1px solid #ddd;
            border-radius: 2px;
            padding: 0px;
        }
        
        .todo-empty {
            height: 40px;
            line-height: 40px;
            border: 1px solid #ddd;
            border-radius: 2px;
            padding-left: 5px;
            margin-top: 10px;
        }
        /*item*/
        
        li {
            list-style: none;
            height: 36px;
            line-height: 36px;
            padding: 0 5px;
            border-bottom: 1px solid #ddd;
        }
        
        li label {
            float: left;
            cursor: pointer;
        }
        
        li label li input {
            vertical-align: middle;
            margin-right: 6px;
            position: relative;
            top: -1px;
        }
        
        li button {
            float: right;
            display: none;
            margin-top: 3px;
        }
        
        li:before {
            content: initial;
        }
        
        li:last-child {
            border-bottom: none;
        }
        /*footer*/
        
        .todo-footer {
            height: 40px;
            line-height: 40px;
            padding-left: 6px;
            margin-top: 5px;
        }
        
        .todo-footer label {
            display: inline-block;
            margin-right: 20px;
            cursor: pointer;
        }
        
        .todo-footer label input {
            position: relative;
            top: -1px;
            vertical-align: middle;
            margin-right: 5px;
        }
        
        .todo-footer button {
            float: right;
            margin-top: 5px;
        }
    </style>
</head>
<div class="big-box">
    <div class="header">
        <div id="root">
            <div class="todo-container">
                <div class="todo-wrap">
                    <div class="todo-header">
                        <input type="text" placeholder="请输入你的任务名称，按回车键确认" />
                    </div>
                    <ul class="todo-main">
                        <li>
                            <label>
                      <input type="checkbox"/>
                      <span>xxxxx</span>
                    </label>
                            <button class="btn btn-danger" style="display:none">删除</button>
                        </li>
                        <li>
                            <label>
                      <input type="checkbox"/>
                      <span>yyyy</span>
                    </label>
                            <button class="btn btn-danger" style="display:none">删除</button>
                        </li>
                    </ul>
                    <div class="todo-footer">
                        <label>
                    <input type="checkbox"/>
                  </label>
                        <span>
                    <span>已完成0</span> / 全部2
                        </span>
                        <button class="btn btn-danger">清除已完成任务</button>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<body>

</body>

</html>